x = list(map(float,input().split()))

y = round(((x[0]-x[2])**2 + (x[1]-x[3])**2)**0.5,8)

print(y) x = list(map(float,input().split())) x list(map(float,input().split())) list map(float,input().split()) map float input().split() ().split () input split y = round(((x[0]-x[2])**2 + (x[1]-x[3])**2)**0.5,8) y round(((x[0]-x[2])**2 + (x[1]-x[3])**2)**0.5,8) round ((x[0]-x[2])**2 + (x[1]-x[3])**2)**0.5 (x[0]-x[2])**2 + (x[1]-x[3])**2 (x[0]-x[2])**2 x[0]-x[2] x[0] x 0 x[2] x 2 2 (x[1]-x[3])**2 x[1]-x[3] x[1] x 1 x[3] x 3 2 0.5 8 print(y) print y x = list(map(float,input().split())) list(map(float,input().split())) x y = round(((x[0]-x[2])**2 + (x[1]-x[3])**2)**0.5,8) round(((x[0]-x[2])**2 + (x[1]-x[3])**2)**0.5,8) y
x = list(map(float,input().split()))

y = round(((x[0]-x[2])**2 + (x[1]-x[3])**2)**0.5,8)

print(y)
